Multi-Coil Wireless Power Transfer for Coil Size Mismatch
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Solution Overview
Problem
The inefficiency in wireless power transmission due to size differences between coils in electronic devices, leading to reduced coupling coefficients, increased heat, and power consumption, is not effectively addressed by existing technologies.
Innovation Solution
An electronic device equipped with a multi-coil circuit and a magnetic field control circuit that identifies a coil with a small size difference from an external device, allowing for efficient power transmission by adjusting operating frequencies and voltages to optimize power transfer through the first and second coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single coil is used for wireless power transmission, then the device structure is simple, but power transmission efficiency is reduced due to size differences between coils
Solution Approach 1:
The patent divides the wireless power transmission system into multiple coils with different sizes (first coil and second coil) instead of using a single coil. This segmentation allows the system to select the most appropriate coil based on the size of the external device, thereby improving power transmission efficiency while managing structural complexity through modular design.
Solution Approach 2:
The patent implements dynamic selection between different coils based on real-time detection of external device characteristics. The controller dynamically switches between the first coil and second coil depending on which coil size provides better coupling with the detected external device, optimizing power transmission efficiency adaptively.
2Adaptability or versatility
If coil size difference is large, then the device can accommodate various external devices, but coupling coefficient is reduced leading to increased heat and power consumption
Solution Approach 1:
The system dynamically selects between different coil configurations based on the detected external device characteristics. By adapting the coil selection to match the external device size, the system maintains optimal coupling coefficients across various device types, thereby reducing heat generation and power consumption while preserving versatility.
Solution Approach 2:
The patent changes the physical parameter of coil size by providing multiple coils with different dimensions. This parameter variation allows the system to match the coil size to the external device size, optimizing the coupling coefficient and reducing unwanted effects like heat generation while maintaining broad compatibility.
3Device complexity
If operating frequency is not adjusted, then the control is simple, but power transmission efficiency is degraded due to coil size mismatch
Solution Approach 1:
The controller dynamically adjusts the operating frequency based on which coil is currently selected and the detected external device characteristics. This dynamic frequency adjustment optimizes the resonant coupling between the transmission coil and the external device coil, improving power transmission efficiency while the control system manages the complexity through automated detection and adjustment.
Solution Approach 2:
The system implements a feedback mechanism where the controller detects external device characteristics, selects the appropriate coil, and adjusts the operating frequency accordingly. This closed-loop feedback ensures optimal power transmission efficiency is maintained by continuously adapting the operating parameters based on the actual transmission conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances power transmission efficiency while minimizing leakage H-field, thereby improving the overall performance of wireless power transfer.
Implementation Method 1
The magnetic induction scheme transfers power using the magnetic field induced in a coil. The magnetic induction scheme supply energy to the load by flowing an induced current through a reception coil using the magnetic field generated from the current flowing through a transmission coil.
Implementation Method 2
Wireless power transfer may include a magnetic induction scheme, a magnetic resonance scheme, or other various wireless power transfer schemes.
Data Source
AI summary
According to various embodiments, an electronic device may comprise a battery, a multi-coil circuit including a first coil and a second coil, a magnetic field control circuit electrically connected with the multi-coil circuit, a power management module electrically connected with the battery and the magnetic field control circuit, and a processor electrically connected with the multi-coil circuit, the magnetic field control circuit, and the power management module. Upon detecting an external electronic device to receive wireless power, the processor may control the magnetic field control circuit to transmit power having a first characteristic to the external electronic device through the first coil, and upon transmitting the power having the first characteristic, control the magnetic field control circuit to maintain transmission through the first coil based on a first operating frequency and a threshold operating frequency in a designated frequency range, or upon transmitting the power having the first characteristic, adjust an operating voltage based on the first operating frequency and the threshold operating frequency and control the magnetic field control circuit to transmit power having a second characteristic through the first coil and the second coil based on a first frequency varied in response to the adjusted operating voltage. Other embodiments may also be possible.